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Goodwill and Other Intangible Assets - Summary of Changes in Quanta's Goodwill (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Goodwill [Line Items]    
Goodwill balance $ 1,537,645 $ 1,470,811
Goodwill acquired 255,806 64,779
Foreign currency translation related to goodwill (12,734) 2,055
Goodwill balance 1,780,717 1,537,645
Electric Power Division [Member]
    
Goodwill [Line Items]    
Goodwill balance 1,065,152 988,702
Goodwill acquired 112,549 57,451
Foreign currency translation related to goodwill (9,617) 2,087
Operating unit reorganization   16,912
Goodwill balance 1,168,084 1,065,152
Oil and Gas Infrastructure Division [Member]
    
Goodwill [Line Items]    
Goodwill balance 137,703 113,598
Goodwill acquired 143,257 7,328
Foreign currency translation related to goodwill (3,117) (32)
Operating unit reorganization   16,809
Goodwill balance 277,843 137,703
Fiber Optic Licensing Division[Member]
    
Goodwill [Line Items]    
Goodwill balance 334,790 368,511
Goodwill acquired      
Foreign currency translation related to goodwill     
Operating unit reorganization   (33,721)
Goodwill balance $ 334,790 $ 334,790